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Which peptides are most counterfeited — and how do I check a batch?

pepmg has no data source that could rank which peptides are most counterfeited, so it will not assert one — a counterfeiting ranking would be a claim it cannot back. What it can do is point to the verifiable process for checking any batch, which is the part that is actually within reach.

Look at testing behavior rather than reputation: whether a vendor publishes a Certificate of Analysis, and whether the results are lab-hosted (viewable on the testing lab's own site) rather than self-hosted or unattributed. The only thing that speaks to the specific vial in your hand is independent testing — sending a small sample to a lab for HPLC purity and mass-spec identity, then verifying the report through the lab's own verification key or public database. pepmg does not test material or certify authenticity.

From: How to test your own vial

All help topics · Answers restate pepmg's own pages; the linked section is the authority.

All products listed are sold by third-party vendors for laboratory and research use only (RUO). Where an FDA label or a peer-reviewed study has published a dose, pepmg reports it with the source named, because that is safer than guessing. It is a report, not medical advice and not a recommendation to use anything. pepmg sells nothing and ships nothing. Listings are price-tracking data, not endorsements.